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Method for preparing titanium dioxide hydrosol at room temperature, titanium dioxide hydrosol and application thereof

A titanium dioxide and hydrosol technology, applied in titanium oxide/hydroxide, titanium dioxide, chemical instruments and methods, etc., can solve the problem of particle aggregation and surface hydroxylation reduction, material specific surface area and hydroxylation degree reduction, powder shape Irregular appearance and other problems, to achieve the effect of saving energy, good visible light catalytic activity, and simple equipment

Inactive Publication Date: 2017-01-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Co-precipitation method, molten salt method, and sol-gel method generally require subsequent high-temperature treatment, which requires high energy consumption, and treatment at high temperature will lead to uneven particle size distribution or irregular powder morphology, and due to grain growth and surface The dehydroxylation process often causes a significant decrease in the specific surface area and degree of hydroxylation of the material, resulting in a decrease in catalytic activity.
Although the hydrothermal method can prepare nano-titanium dioxide photocatalysts, the reaction temperature is usually above 150 °C, and centrifugation or filtration of the reaction product after hydrothermal treatment will lead to particle accumulation and a decrease in the degree of surface hydroxylation.

Method used

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  • Method for preparing titanium dioxide hydrosol at room temperature, titanium dioxide hydrosol and application thereof
  • Method for preparing titanium dioxide hydrosol at room temperature, titanium dioxide hydrosol and application thereof
  • Method for preparing titanium dioxide hydrosol at room temperature, titanium dioxide hydrosol and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] First, drop 0.53ml of acetic acid and 0.53ml of lactic acid into 0.42ml of acetylacetone solution, and stir it magnetically for 10 minutes at a stirring rate of 30r / min to obtain a uniform solution A; then drop 1.72ml of tetrabutyl titanate solution into Into solution A, the titration rate is 1mL / min, by magnetic stirring for 1h, the stirring rate is 50r / min, to obtain a uniform solution B; then 100ml of deionized water is added dropwise to solution B at a titration rate of 10mL / min , by magnetic stirring for 1h, the stirring rate is 50r / min, to obtain TiO 2 Hydrosol photocatalyst.

[0034] figure 1 TiO prepared for Example 1 of the present invention 2 The x-ray diffraction pattern of hydrosol after drying, by figure 1 It can be seen that the prepared TiO 2 Anatase TiO 2 .

[0035] figure 2 TiO prepared for Example 1 of the present invention 2 Transmission electron microscope photographs of hydrosols, by figure 2 It can be seen that TiO 2 The particle size i...

Embodiment 2

[0039] First drop 0.42ml of acetic acid and 0.42ml of lactic acid into 0.35ml of acetylacetone solution, stir for 10min by magnetic force at a stirring rate of 40r / min to obtain a uniform solution A; then drop 1.72ml of titanium tetrachloride solution into In solution A, the titration rate is 1mL / min, and magnetically stirred for 2h at a rate of 50r / min to obtain a uniform solution B; then 100ml of deionized water is added dropwise to solution B at a titration rate of 10mL / min, By magnetic stirring for 1h, the stirring rate was 50r / min to obtain TiO 2Hydrosol photocatalyst. The visible photocatalytic performance test is the same as in Example 1, and the results show that the photocatalytic degradation rate of methyl orange is 91.8%.

Embodiment 3

[0041] First, drop 1.05ml of acetic acid and 1.05ml of lactic acid into 0.95ml of ethylenediamine solution, and stir it magnetically for 10 minutes at a stirring rate of 30r / min to obtain a uniform solution A; then drop 3.10ml of tetrabutyl titanate solution into solution A, the titration rate is 1mL / min, stirred by magnetic force for 2h, and the stirring rate is 60r / min, to obtain a uniform solution B; In, by magnetic stirring for 2h, the stirring rate is 60r / min, to obtain TiO 2 Hydrosol photocatalyst. The visible light photocatalytic performance test is the same as in Example 1, and the results show that the photocatalytic degradation rate of methyl orange is 93.6%.

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Abstract

The invention discloses a method for preparing a titanium dioxide hydrosol at room temperature. The method comprises the following steps: (1) measuring the same volume of acetic acid and lactic acid, dropwisely adding into organic solvent, and performing uniform magnetic stirring to obtain a solution A; (2) dropwisely adding a titanium source into the solution A, and performing uniform magnetic stirring to obtain a solution B, wherein the titanium source is titanium tetrachloride, isopropyl titanate or tetrabutyl titanate, and the volume ratio of the titanium source to the solution A is (1:1)-(3:1); and (3) dropwisely adding deionized water into the solution B, and performing magnetic stirring to obtain the TiO2 hydrosol. The invention also discloses the titanium dioxide hydrosol prepared by the method for preparing a titanium dioxide hydrosol at room temperature and application thereof. According to the invention, preparation of a titanium dioxide hydrosol visible light photocatalyst under room temperature conditions is realized, and energy is saved; and the titanium dioxide hydrosol has favorable visible light catalytic activity.

Description

technical field [0001] The invention relates to a titanium dioxide hydrosol, in particular to a method for preparing the titanium dioxide hydrosol at room temperature, the titanium dioxide hydrosol and its application. Background technique [0002] Photocatalytic technology is an advanced oxidation technology that utilizes photocatalytic materials to realize light source (such as sunlight) to stimulate catalytic degradation of organic matter, and plays an important role in the control and governance of environmental pollution. As a typical photocatalytic material, titanium dioxide has the advantages of stable photochemical properties, non-toxicity, low price, can oxidize and degrade most organic pollutants and does not produce secondary pollution, etc. It is one of the most potential green catalysts. one. However, TiO 2 is a wide bandgap (E g =3.2eV) semiconductor oxides, which can only absorb the energy of the shorter wavelength ultraviolet light (λ≤387nm) in sunlight, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06C02F1/30C01G23/053C02F101/38
CPCC01G23/053C01G23/0536C02F1/30B01J21/063C01P2002/72C01P2004/04C02F2305/10C02F2101/40B01J35/23B01J35/39
Inventor 陈志武朱成彬卢振亚江训洋
Owner SOUTH CHINA UNIV OF TECH
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